fix(frontend): cancel exponential-backoff poll on unmount/wallet chan…

[GOE001]

…ge (#1209)

The pollIndexerForWithdraw loop could run for ~63s with no abort mechanism, causing stale fetches and state writes after the user navigated away or switched wallets.

• Thread an AbortController through the polling loop via a useRef
• Abort on component unmount and wallet/publicKey change via useEffect cleanup
• Check signal.aborted before each fetch, state update, and after delay
• Add test verifying unmount mid-backoff stops further fetches

Description

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 Documentation update
• 🔧 Refactoring (no functional changes)
• ⚡ Performance improvement
• 🧪 Test addition or update

Related Issues

Closes #1209

Changes Made

Testing

Test Coverage

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed

Test Steps

Breaking Changes

Breaking Changes:

Migration Guide:

Screenshots/Demo

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• Updated Postman/Hoppscotch API collections if routes changed
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published
• I have checked for breaking changes and documented them if applicable

Additional Notes